口算.
1
3
×
3
5
=

1
3
=

2
5
×10=

2
3
=

2
5
+
3
5
=
3
8
÷
1
2
=
1-
4
7
=
5
7
-
3
7
=
1
5
+
1
3
=
1.8×3=
分析:分?jǐn)?shù)乘法:分子相乘的積作為分子,分母相乘的積作為分母;分?jǐn)?shù)除法:除以一個(gè)數(shù)等于乘這個(gè)數(shù)的倒數(shù);同分母分?jǐn)?shù)相加減,分母不變,分子相加減;異分母分?jǐn)?shù)相加減,先通分化成同分母的分?jǐn)?shù),再計(jì)算.
解答:解:
1
3
×
3
5
=
1
5
,

1
3
=15,

2
5
×10=4,

2
3
=0,

2
5
+
3
5
=1,
3
8
÷
1
2
=
3
4
,
1-
4
7
=
3
7
,
5
7
-
3
7
=
2
7
1
5
+
1
3
=
8
15
,
1.8×3=5.4.
故答案為:
1
5
,15,4,0,1,
3
4
3
7
,
2
7
8
15
,5.4.
點(diǎn)評(píng):本題考查了分?jǐn)?shù)的基本運(yùn)算,注意運(yùn)算的法則,把結(jié)果化成最簡(jiǎn)分?jǐn)?shù).
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